(a) Why is methanol, or some other carbon source, needed in biological denitrification?
(b) Calculate the methanol demand for denitrifying 1 m3 of nitrified effluent with a nitrate nitrogen concentration of 25 mg/l and dissolved oxygen concentration of 8 mg/l. Express your answer in grams of methanol and liters of 95% methanol with a specific gravity of 0.82.
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